I see that they say SSL certificate does not include server name. Did you generate a csr (Certificate Signing Request) and did you use the server name as the CN (Common Name?)

https://www.digitalocean.com/community/ ... r-centos-7 seems to be a simple and accurate guide. You might want to start from scratch. When you make your CSR, the most important thing is the common name, it has to match what you have configured as the server name, and the server name should be configured in httpd.conf or another .conf file if you're doing a more complex setup. It sounds as if you're doing a default setup though, so in that case, configure the server name in httpd.conrf